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  • 1 University of Utah, School of Medicine Environmental Radiation and Toxicology Laboratory 84112 Salt Lake City Utah USA
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The results on the concentrations of thorium, uranium, and plutonium in human tissues of world-wide general populations are summarized. The majority of thorium and uranium are accumulated in the skeleton, whereas, plutonium is divided between two major organs; the liver and skeleton. However, there is a wide variation in the fractions of plutonium in the liver and the skeleton of the different populations.